This article mainly introduces the thinkPHP5.0 frameworkNamespace, combined with specific examples, a detailed analysis of the concept, function and related usage of namespaces in thinkPHP5.0. Friends in need can refer to the following
The examples in this article describe the thinkPHP5.0 framework namespace. Share it with everyone for your reference, the details are as follows:
Namespace
ThinkPHP adopts namespace definition and automatically loads class library files, which is effective It effectively solves the namespace conflict problem between multiple modules and Composer class library, and implements a more efficient automatic loading mechanism of class libraries.
Special attention Yes, If you need to call PHP's built-in class library, or a third-party class library that does not use the namespace, remember to add \ when instantiating the class library, for example:
// 错误的用法
$class = new stdClass();
$xml = new SimpleXmlElement($xmlstr);
// 正确的用法
$class = new \stdClass();
$xml = new \SimpleXmlElement($xmlstr);
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In ThinkPHP5.0, you only need to correctly define the namespace where the class library is located, and the path of the namespace is consistent with the directory of the class library file, then the automatic loading of classes can be achieved, thereby achieving true Lazy loading.
For example, the \think\cache\driver\File class is defined as:
namespace think\cache\driver;
class File
{
}
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If we instantiate this class, it should be:
$class = new \think\cache\driver\File();
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The system will automatically load it The class file corresponding to the path of this class is thinkphp/library/think/cache/driver/File.php.
5.0 The default directory specification is lowercase, class file naming is camel case, and the first letter is capitalized.
In principle, directories named in camel case can be supported, as long as the namespace definition is consistent with the directory, for example:
We instantiate
$class = new \think\cache\driver\File();
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The system will automatically load the thinkphp/library/Think/Cache/Driver/File.php file.
Root namespace (class library package)
The root namespace is a key concept, taking the above \think\cache\driver\File class as an example, think is a root namespace, and its corresponding initial namespace directory is the system's class library directory (thinkphp/library/think). We can simply understand that a root namespace corresponds to a class library package.
Several root namespaces (class library packages) built into the system are as follows:
namespace app\index\controller;
use model\User;
class Index
{
public function index()
{
$user = new User();
}
}
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